Electric bed warmer



\ March 16,1943. G, w CRISE 2,313,864=

v ELECTRIC BED WARMER Filed Aug. 2, 1940 4 w INVENTOR.

Patented Mar. 16, 1943 r UNITED STATES PATENT OFFICE 2.313.864 ELECTRIC BED WARNER George W. Crise, Columbus, Ohio Application August 2, 1940, Serial No. 349,789

4 Claims. (CL 219-46) The purpose of my invention is to provide a safe and convenient method of uniformly warming a bed.

Previous bed warmers have been characterized by their inability to distribute the heat uniformlythroughoutthe bed clothing and the inconvenience of having to move the device whenever the bedding is changed or rearranged.

To eliminate these difllculties, I have provided a mattress warmer suiliciently thin and flexible to be comfortable to sleepupon, large enough to warm substantially all of a bed and having sufficient radiating area to prevent overheating un der all conditions.

The details of my invention will be best understood by referring to the accompanying drawing in which- Figure l is a bed with a mattress cut away to show my mattress warmer installed inside a mattress.

Figure 2 is a detailed view of my mattress warmer with part of the Jacket removed to show the details of construction as it is built for installation on top of a conventional mattress.

Referring to Figure 1, I is a bed, 2 is a mattress installed in the conventional manner, I is the upper mattress covering, is a flexible warming element made of soft copper wire, I is an electrical cord leading to a wall outlet 6, and 1 is a feed thru switch conveniently located at the head of bed I, and so connected as to control the current flowing to mattress warming element 4.

In Figure 2, I is the upper jacket of my mattress warmer which is made of muslin and partly cut away to show the internal construction of my warming unit. mattress warmer, being similar to upper jacket l0. l2, l3, and I4 are uniformly spaced quilted seams of thread which join jackets Ill and II,

- leaving a margin of approximately one inch unfastened at each of their ends. l2, l3, and H are representative of some 50 similar seams which Join jackets l0 and II forming many fabric tubes all of which I designate collectively as tubes l5 and I6.

4 is a warming element consisting of double enameled N0. 30 copper wire which is threaded into tubes l5 and It by means of a long bodkin.

For this operation the eye of the bodkin carrying the wire is inserted into the lower end of the tube nearest an edge which is designated as starting point it and the wire pushed to the opposite end of said tube, at this point a string 18 which has been made fast to the lower Jacket II is passed between the warming element wire and the bodkin, on the side of the bodkin where the wire leads from the eye of the bodkin to the starting point It. As the bodkin is withdrawn, string I! holds the warming element wire 4 in place producing a hairpin loop in the first tube above described. Bynext inserting the bodkin in the second or'adiacent tube, the second seam of group l2, l3, and I4 whose ends are designated as 20 and 2| and which acts as a support for string II at point 20, also supports warming element 4 at point 2|. I

It is obvious that by threading all of the tubes II and I8 consecutively, a warming element of the size and shape of Jackets Ill and II is produced.

Referring further to Figure 2, I is a two .conductor cord which is anchored and connected to warming element 4 at starting point 18 and to finishing point of warming element, at finishing point 22. I is a conventional feed thru switch which controls the current flowing from attachment plug 8 to the mattress warmer.

The completely assembled unit has hemmed edges which hold all wires in place making my mattress warmer a completely finished unit, the

appearance of which is in keeping with conventional bed clothing.

II is the lower jacket of my mattress, or the mattress of Figure 1 be equipped with the warming element as constructed in Figure 2, the same general results be obtained.

7 It will also be evident that when all bedding has been placed on bed I and current is turned on by switch I, a uniform warmth is generated over the entire surface of the mattress. Obviously the heat thus evolved radiates into both the mattress and the bedding with the result that in the few minutes required to prepare for bed, the bed becomes uniformly warmed, because of the large radiating areathe terminal temperature of my standard 200 watt mattress warmer.

- is less than 180 degrees Fahrenheit with aura):-

imum of bed clothing, thus eliminating the fire When both the bed and the bimetal switch have cooled, it again snaps back on full power.

Having described the construction of my mattress warmer and the novel results obtained when used in combination with a bed as described, I claim:

1. In an electric warming pad constructed with parallel pockets the method of installating a warming filament which consists of inserting hairpin loops of said filament into consecutive elongated pockets of said pad by means of a bodkin, anchoringthe closed end 0L each hairpin loop and withdrawing the bodkin leaving a com plete hairpin loop in each individual pocket.

2. In a warming pad the method of construction which consists of Joining two thin sheets of fabric by parallel seams and threading the tubes thus produced consecutively and from adjacent I ends each with a complete hairpin loop formed of fine wire.

3. A mattress warmer of thin section compris- "loops, each complete loop being threaded into a 1 of saidbed warmer.

single and separate adjacent tube and a thermally operated time switch connected to said filament whereby the circuit of said filament is automatically broken independent of the influence of the temperature ,of the surrounding zone GEORGE w. CRIBE. 

